CASE LAW - Bayfield v British Columbia (Ministry of Transportation)
Christine Bayfield was driving her van southbound on the Inland Island Highway in rainy and wet road conditions. She overtook a logging truck to avoid being sprayed by the water it picked up off the pavement. As she passed, she lost control, began to rotate and left the pavement, rolling over in the median.

Question: I just wanted to confirm, but it seems to me that Christmas lights on your vehicle would be considered unauthorized lighting and illegal. I've known a few people to run them, never heard of anyone actually getting tickets for it.
From the video description: If you are travelling BC highways during the winter months please be prepared and be aware - drive to conditions and take your time to get where you’re going. Our maintenance contractors are out there clearing our highways and provincial roads to make it safer for those driving on them and so we are asking anyone who is on the road with a snow plow to please steer clear and let them clear the road. It is never safe to pass a snow plow on the right or weave between plows when they are clearing the road.
A reader was travelling in a major municipality recently and was stopped in a large collection of vehicles waiting for a red light at the intersection of two multiple lane highways.